a solution has a volume of 121 ml and concentration of 0.11 m nacl. what is the number of moles of nacl in this solution? 0.121 l x 0.11 mol/l 0.11 (mol/l) / 0.121 l 0.121 l / (0.11 (mol/l))

The specific heat of the metal is 19.99 J / g·°C

Given,

We are required to find the specific heat of the metal.

Specific Heat Formula

We know that the specific heat of a substance is defined as the amount of heat energy required to raise the temperature of 1 gram of that substance by 1° C.

It is denoted by “C.”From the problem, the heat gained by the water will be equal to the heat lost by the metal. This can be represented by the equation below:

q gained by the water = q lost by the metal where, q = m * C * ∆T

where, m is the mass of the substance , C is the specific heat of the substance , ∆T is the change in temperature of the substance

The heat gained by the water can be calculated as:

q gained by the water = m * C * ∆T= 50.00 g * 4.184 J/g·°C * (20.15 - 12.6)°C= 50.00 g * 4.184 J/g·°C * 7.55°C= 1576.78 J

The heat lost by the metal can be calculated as:

q lost by the metal = m * C * ∆T= 25.00 g * C * (99.0 - 20.15)°C= 25.00 g * C * 78.85°C= 1971.25 C * g * °C

The two equations can be equated to get:

C * 78.85°C = 1576.78 JC = 1576.78 J / 78.85°C= 19.99 J / g·°C

Therefore, the specific heat of the unknown metal is 19.99 J / g·°C.

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Answer: Heyo Kenji Here! Here's your answer- The electricity that is conducted through copper wires in your home consists of moving electrons. The protons and neutrons of the copper atoms do not move. The actual progression of the individual electrons in a given direction through the wire is quite slow.

Explanation: Hope this helps!

Have a nice day!

- Kenji ^^

Answer:

Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties. Dalton based his theory on the law of conservation of mass and the law of constant composition. The first part of his theory states that all matter is made of atoms, which are indivisible.

Explanation:

Explanation:

To find the freezing point of the solution, we can use the freezing point depression equation:

ΔT = Kᵣ x m

Where ΔT is the change in freezing point, Kᵣ is the freezing point depression constant of benzene, and m is the molality of the solution.

Substituting the values from the problem, we get:

ΔT = 5.12 °C/m x 2.8 m

ΔT = 14.34 °C

Since ΔT = Tᵢ - T, where Tᵢ is the freezing point of the solvent (benzene) and T is the freezing point of the solution, we can rearrange the equation to solve for T:

T = Tᵢ - ΔT

T = 5.50 °C - 14.34 °C

T = -8.84 °C

Therefore, the freezing point of the solution is -8.84 °C.

Answer:The freezing point of the solution is -8.84 °C.

Explanation:

The volume of \(9.94 * 10^2^3\) atoms of\(Br_2\)is approximately 36.8784 liters.

To calculate the volume of a given number of atoms, we need to know the density of the substance and the molar mass. In this case, we have the number of \(Br_2\) molecules, and we need to convert it to volume.

First, we need to convert the number of atoms to moles. Since there are Avogadro's number (\(6.022 * 10^2^3\)) of atoms in one mole of any substance, we can calculate the number of moles as follows:

Number of moles = Number of atoms / Avogadro's number

= \((9.94 * 10^2^3) / (6.022 * 10^2^3)\)

= 1.649 moles (approximately)

Next, to calculate the volume, we need the molar volume, which is the volume occupied by one mole of a substance. At standard temperature and pressure (STP), the molar volume is approximately 22.4 liters per mole.

Volume = Number of moles x Molar volume

= 1.649 moles x 22.4 L/mol

= 36.8784 liters (approximately)

Therefore, the volume of \(9.94 * 10^2^3\)atoms of \(Br_2\) is approximately 36.8784 liters.

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Less actual collisions. Because there is fewer N₂ molecule to collision with H₂ molecules, the forward reaction's pace slows down. Because crashes happen less frequently, the rate decreases.

In a chemical reaction, one or more chemicals, usually known as reactants, change into same or more other compounds, frequently referred to as products.

Pairing, decomposition, fixed, double-replacement, and conflagration are the five fundamental kinds of chemical processes. You may classify a reaction into one of these groups by looking at the reactants and products. Several categories will apply to some reactions.

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The complete question is-

Given the equation representing a reaction at equilibrium:

N₂(g) + 3H₂(g) <==>2NH₃(g)

Explain, in terms of collision theory, why the rate of the forward reaction decreases when the concentration of N₂(g) is decreased.

Based on the given information, the reaction that occurred when the 15.0 g sample of the white, solid substance was heated in the presence of air is most likely a combustion reaction.

The initial mass of the substance was 15.0 g, and after heating, the mass decreased to 12.6 g. This decrease in mass indicates that a chemical reaction took place, resulting in the loss of some of the substance.

In the presence of air, a common type of reaction that occurs is combustion. Combustion reactions involve the reaction of a substance with oxygen, resulting in the production of carbon dioxide and water. In this case, the substance being heated reacted with oxygen from the air, leading to the loss of mass.

To confirm that combustion occurred, we can analyze the change in mass. Since the mass decreased, it suggests that the substance lost some of its carbon and/or hydrogen atoms in the form of carbon dioxide and water, respectively.Therefore, the reaction that took place can be classified as a combustion reaction. However, without knowing the specific identity of the substance, it is not possible to provide a detailed chemical equation for the reaction.
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Note: The question is complete and same on the search engine.

According to the law of mass conservation, the reduction in total mass may NEVER occur as a result of a chemical reaction.

This law explains that the total mass of the reactants is always equal to the total mass of the products, meaning that during a chemical reaction, the atoms of the starting materials are rearranged to form new substances and no new chemical species are created or destroyed. Therefore, the mass of the reactants is always conserved and remains constant throughout the reaction.

This law states that the total mass of the reactants must be equal to the total mass of the products in a closed system. So, while new chemical species may be created, starting materials may react, and substances may be rearranged, the overall mass must remain constant throughout the reaction.

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Answer: 11.04 atm

Explanation:

P1/T1 = P2/T2 this is the Gay-Lussac law

Temperature must be in kelvin

P2=P1T2/T1

8.7 X 352.85 /278.05

Answer:

Structural formulas are helpful because they explain the properties and structure of the compound which empirical and molecular formulas cannot always represent.

Explanation:

HOPE ITS HELPFUL FOR U

The answer is  -594 kJ. To calculate the enthalpy change of the reaction, we need to use the equation: ΔH = ΣnΔHf(products) - ΣnΔHf(reactants)

To calculate the enthalpy change of the reaction, we need to use the equation:
ΔH = ΣnΔHf(products) - ΣnΔHf(reactants)
Where ΔH is the enthalpy change, ΣnΔHf is the sum of the standard heats of formation of the products or reactants, and n is the stoichiometric coefficient of each compound.
Using the given values:
ΔH = [(ΔHf(CH3OH) + ΔHf(H2)) - (ΔHf(CH4) + ΔHf(H2O))] x n

ΔH = [(-238 kJ/mol + 0 kJ/mol) - (-75 kJ/mol + (-242 kJ/mol))] x 1
ΔH = (-238 + 75 + 242 + 0) kJ/mol

ΔH = -594 kJ/mol
Therefore, the enthalpy change of the reaction is -594 kJ/mol.

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The VSEPR model predicts the geometry of molecules. The correct answer is C) less than 109.5° but greater than 90°. In fact, the actual bond angle in \(H_3O+\) is approximately 104.5°.

In the case of \(H_3O+\), there are four electron pairs around the central oxygen atom. Three of these pairs are bonding pairs, forming covalent bonds with the three hydrogen atoms, while the fourth pair is a lone pair. According to the VSEPR model, the electron pairs will arrange themselves as far away from each other as possible, leading to a tetrahedral geometry. The lone pair will take up more space than the bonding pairs, causing the H-O-H bond angle to be less than the ideal tetrahedral angle of 109.5°. Understanding the VSEPR model is important for predicting the geometry and bond angles of molecules and ions, which can in turn affect their physical and chemical properties.

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Answer:

the moon

Explanation:

Answer:

The orest one is possible D

Explanation:

1) The dream of Mendeleev concerned the arrangement of the elements by mass

2) Periodicity is the changing properties of the elements

3)

Antoine Lavoisier - Arranged the elements by their properties

Johann Döbereiner - Arranged the elements into triads

John Newlands - Arranges the elements according to the order of increasing atomic mass

We define the periodic table as the arrangement of the elements in order of increasing atomic numbers. We know can see that several attempts have been made at the systematization of the elements and the approaches to the problem have taken different dimensions. In a dream, Mendeleev saw the elements line up in order of atomic masses and there was a visible pattern.

The term periodicity has to do with the regular repeating property of the elements and this can be seen when we follow the properties of the elements as they change down the group and across the period.

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The answer is option

The reaction:

is a Synthesis reaction, because from 2 different substances it is produced

A reaction with a negative ΔH and a positive ΔS is spontaneous at high temperatures.

When considering the enthalpy change (ΔH) and entropy change (ΔS) of a reaction, their signs provide insights into the spontaneity of the reaction.

A negative ΔH indicates an exothermic reaction, releasing energy to the surroundings. A positive ΔS suggests an increase in the disorder or randomness of the system.

In the given scenario, where the reaction has a negative ΔH and a positive ΔS, the reaction is spontaneous at high temperatures.

This means that at elevated temperatures, the reaction will proceed in the forward direction without requiring an external input of energy.

The increase in disorder (positive ΔS) overcomes the decrease in energy (negative ΔH), driving the reaction forward.

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Answer:

this is your answer hope it helps you

32 i think but im not that sure

Answer:

33

Explanation:

The spontaneity of a reaction is determined by the Gibbs free energy change (∆G), which is a measure of the system's ability to do work.

The equation that links ∆G, ∆H, and ∆S is: ∆G = ∆H - T∆S, where T is the temperature in Kelvin and ∆H and ∆S are the enthalpy and entropy changes, respectively. The signs of ∆H and ∆S determine whether the reaction is exothermic or endothermic and whether it is entropy-driven or enthalpy-driven, respectively.

If ∆G is negative, the reaction is spontaneous, meaning it occurs without the input of energy.The given reaction has a ∆H of 23.25 kJ and a ∆S of 161.26 J/mol∙K.

First, we need to convert the units of ∆S from J/mol∙K to kJ/mol∙K by dividing by 1000.∆S = 161.26 J/mol∙K ÷ 1000 = 0.16126 kJ/mol∙K Substitute the values into the equation to determine the spontaneity of the reaction:

∆G = ∆H - T∆S∆G = (23.25 kJ) - (298 K) x (0.16126 kJ/mol∙K)∆G = 23.25 kJ - 48.02 kJ∆G = -24.77 kJ Since ∆G is negative, the reaction is spontaneous.

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A 545 mL volume of concentrated hydrochloric acid should be used to prepare 7 L of a 0.8 mol/L HCl(aq) concentration solution.

Calculate the number of moles of HCl required for the desired solution:

  Moles of HCl = Concentration × Volume

                         = 0.8 mol/L × 7 L = 5.6 moles

Determine the mass of HCl required:

  Mass of HCl = Moles of HCl × Molar Mass of HCl

  The molar mass of HCl is approximately 36.46 g/mol.

  Mass of HCl = 5.6 moles × 36.46 g/mol = 204.376 g

Calculate the mass of concentrated hydrochloric acid needed:

  Concentrated hydrochloric acid has a concentration of 37.5% HCl in mass.

  Mass of concentrated HCl = Mass of HCl / Percentage of HCl

  Mass of concentrated HCl = 204.376 g / 0.375 = 545.003 g

Determine the volume of concentrated hydrochloric acid using its density:

  Density = Mass / Volume

  Volume = Mass / Density

  Volume = 545.003 g / 1.2 g/cm³

  As we want the volume in milliliters (mL), we need to convert cm³ to mL:

  Volume = 545.003 mL / 1 cm³ = 545.003 mL

Therefore, approximately 545 mL of concentrated hydrochloric acid should be used to prepare 7 L of a 0.8 mol/L HCl(aq) concentration solution.

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The wavelength of the light is approximately 500 nm. The energy of the photon of light is approximately 6.56 x 10-20 J.

Answer: Question 1:The formula relating wavelength, frequency, and the speed of light is given by:c = fλHere,λ = wavelength, f = frequency, c = speed of lightI. n the problem, frequency is given as 5.98 x 1014 s-1. Therefore, using the formula, the wavelength of light can be calculated as follows:λ = c/f= (3 x 108 m/s)/(5.98 x 1014 s-1)≈ 500 nm

Therefore, the wavelength of the light is approximately 500 nm.

Question 2:The formula relating energy and frequency of light is given by:E = hfwhereE = energy of photonh = Planck's constant = 6.626 x 10-34 J s (Joule seconds)f = frequency of lightIn the problem, the frequency of light is given as 9.89 x 1013 Hz. Therefore, using the formula, the energy of the photon of light can be calculated as follows:E = hf= (6.626 x 10-34 J s) x (9.89 x 1013 Hz)≈ 6.56 x 10-20 J

Therefore, the energy of the photon of light is approximately 6.56 x 10-20 J.

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In this case, a water sample has been diluted to 10^-3, which means it has been diluted by a factor of 1,000 times. So, the correct answer is:

The answer is option b. 300.

When a solution is diluted, it means that more solvent (usually water) has been added to decrease the concentration of the solute. The dilution factor is the ratio of the final volume of the solution to the initial volume of the solution.

In this case, the water sample has been diluted to 10-3, which means that the concentration of the original solution has been reduced by a factor of 10-3.

To calculate the dilution factor, we need to take the reciprocal of the concentration reduction factor:

Dilution factor = 1/10-3 = 1,000

So the water sample has been diluted by a factor of 1,000 times.

Therefore, the correct answer is option b. 300 is not the dilution factor, but rather the concentration reduction factor (1/300), which is the reciprocal of the dilution factor.

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Answer:

New pressure = 42216.66 Pa

Explanation:

Given that,

Initial volume, V₁ = 5 m³

Final pressure, P₁ = 101320 Pa

Final volume, V₂ = 12 m³

We need to find the final pressure of the gas. We know that the relation between pressure and volume is given by :

\(P\propto \dfrac{1}{V}\\\\P_1V_1=P_2V_2\\\\P_2=\dfrac{P_1V_1}{V_2}\\\\P_2=\dfrac{101320 \times 5}{12}\\\\P_2=42216.67\ Pa\)

So, the new pressure is equal to 42216.66 Pa.